b = {'csy': 20100902, 'yjl': 20110428, 'bob': 20120618,
     'ljx': 20110815, 'em': 20111124, 't': 20110412, 'xmy': 20120703, 'yy': 19760624, }
n=int(input())
c=0
for k in b:
    if(b[k]==n):
        print(k)
        c=1
        break
if(c==0):
    print("nobob")